Packing for stuffing-boxes



(N Model.) I

w. s. GETGHBLL & R. E. FRENCH. PACKING FOR STUFFING BOXES.

No. 425,776. Patented Apr. 15, 1890.

UNITED STATES PATE T OFFICE.

WINFIELD SCOTT GETOHELL, OF SAN J OSE, AND ROBERT ELLSVORTH FRENCH, OF OAKLAND, CALIFORNIA.

PACKING FOR STUFFING -BOXES.

SPECIFICATION forming part of Letters Patent No. 425,776, dated April 15, 1890.

Application filed January 27, 1890. Serial No. 338,286- (No model.)

To all whom it may concern:

Be it known that we, INFIELD SCOTT GET- CHELL, of the city of San Jose, in the county of Santa Clara, and ROBERT ELLswoRTH FRENCH, of the city of Oakland,in the county of Alameda, and State of California, citizens of the United States, have invented an Im-.

provement in-Packin g for Stuffing-Boxes; and we hereby declare the following to be a full, clear, and exact description thereof.

Our invention relates to that class of packing for stuffing-boXes of all kinds in which contractible metal rings are employed and from which the usual term of metal packing is derived.

Our invention consists in the novel construction, combination, and arrangement of contractible metallic rings, their seats, the compressing-spring, and other details hereinafter fully described, and specifically pointed out in the claims.

The object of our invention is to provide a simple and effective packing for stuffing-boxes of all kinds.

Referring to the accompanying drawing, the figure is a longitudinal section, the working-rod and a portion of the contractible rings and of the dead-ring being shown in elevation.

A is the stuffing-box, and B is the gland, which is secured to its front by the usual boltsb.

O is the working-rod, passing through the stuffing-box and gland.

D is the outer ring-seat, the cylindrical end of which encircles the working-rod, and has within it an interior oil-groove c, communication With which is had through the oil-duct b in the gland B. The inner end of the seat D is enlarged and lies within the end of the stuffing-box, and its interior is made conical or tapering in shape, as shown.

E is the first contractible metal ring, made with a conical periphery to fit the conical seat D and wit-h a fiat top, said ring being severed and its ends separated slightly.

F is the second contraotible metal ring, made like the first, but of larger diameter, having a conical periphery, a flat top and bottom, and resting on the first ring and within the conical seat D, its severed portion being turned,

however, so as to break joints with the severed portion of the ring E.

Upon the ring F is seated the middle, or what we term the dead, ring M, which is a complete unsevered ring. Next to the dead ring is seated at contractible metal ring F, corresponding in shape and dimensions to the ring F, and next to the ring F is seated the contractible metal ring E, corresponding in shape and dimensions to the ring E, its severed portions being arranged to break joints with the ring F.

Over the continuous conical surface or periphery of the two rings E and F is fitted the inner'conical ringseat G, the conical inner surface of which first terminates in the short cylindrical portion 6, which forms a steamgroove, as we shall presently show, and this portionterminates in the cylindrical portion g.

In the periphery of the ring-seat Gis formed a groove g in which are seated the severed spring-rings H, Which we call snap-rings, and which expand to a greater diameter than the periphery of the seat G, so that they completely fill the stuffing-box.

Fitted over the cylindrical end of the ringseat G is one end of a heavyspiral spring I, the other end of which is seated in the inner end of the stuffing-box.

J is a set-screw, which passes through the gland B and bears on the working-rod C, so as to hold said rod, when desired.

The operation of the packing is as follows: All these rings and parts are compressed between the gland B on the one side and the spring I on the other side, so that the tighter the gland is set up the greater the compression of the several parts.

The contractible rings are compressed between the conical seats G and D, in which they fit, and this compression upon their periphery causes them to contract and thereby bind perfectly upon the working-rod. There is no need of any encircling, elastic, or compressible material or band to cause the metallic rings to contract 011 the rod, as their conical seats effect this purpose with absolute accuracy. Some of the steam, working its way into the groove g of the inner ringseat, acts upon the exterior of the inner ring E and serves to additionally contract it. The snap-rings H on the exterior prevent the steam from passing over to the rings. The dead-ring in the middle, having no joint, insures tightness.

The object of the set-screw J is to enable us to hold the working-rod tightly when not in use-as, for instance, in a locomotivewhere it be desired to work one side and not the other. In the old form the packing was cramped upon the rod by the tightening of a screw, so as to hold the rod; but in the presnation with the ring-seats D and G, having conical inner surfaces, the contractible rings- E F F E, having conical outer surfaces and 1 fitted in the conical surfaces of the ring-seats, and the intervening dead-ring M between the contractible rings F and F substantially as described. a

2. In a packing for stuffing-boxes, the ringseat G, having a conical inner surface terminating in an annular groove g, in combination with the contractible ring E, having a conical outer surface fitted in the conical inner surface of the ring-seat, and an unsevered deadringabove the contractible ring, substantially as described.

3. In a packing for stuffing-boxes, the stutting-box, in combination with the ring-seat G, having a conical inner end terminating in a steam-groove and having its exterior provided with a groove 9 and the snap-rings in said exterior groove, substantially as described.

4. A packing for stuffing-boxes, consisting of the opposing ring-seats Dand G, having conical inner surfaces, and the spring and gland for setting them up, the internal groove 9, and the exterior groove 9 of ring-seat G, the snap-rings in said last-named groove, the contractible rings E F F E, having conical outer surfaces and fitting in the ring-seats,

and the intervening dead-ring M, substan-- 

